time pollution
Based on the idea that pollution is "degrading the quality of a common resource", time pollution happens when someone wastes everyone's time, say in a meeting, by talking about something that is useless, uninteresting, irrelevant or purely rhetorical.
"Hey, how did the planning meeting go?" "Oh, you know Bob doesn't know anything. He just created a lot of time pollution. Everyone was just yawning and waiting for it to finish."